FISU - oraganises university world championships for nation member countries (like Universiades)
EUSA - oraganises university european championships for (not nation members) but for several Universities. In many cases - on European championship you can find several university teams from the same country.
ISN'T IT WEIRD?
And isn't EUSA just continental part of FISU - University sport federation?
Do we talk about some elite population?